EXHIBIT 11 PEOPLES BANCORP INC. AND SUBSIDIARIES Computation of Earnings Per Share (dollars in thousands, except share data) For the Three For the Nine Months Ended Months Ended September 30, September 30, 1999 1998 1999 1998 ---------- ---------- ----------- ---------- BASIC EARNINGS PER SHARE EARNINGS: Net income ........................................ $ 2,758 $ 2,096 $ 7,937 $ 7,272 AVERAGE SHARES OUTSTANDING: Weighted average Common Shares outstanding ........ 6,148,492 6,315,498 6,247,907 6,322,345 - ------------------------------------------------------------------------------------------------------- BASIC EARNINGS PER SHARE ................... $ 0.45 $ 0.33 $ 1.27 $ 1.15 - ------------------------------------------------------------------------------------------------------- DILUTED EARNINGS PER SHARE EARNINGS: Net income ........................................ $ 2,758 $ 2,096 $ 7,937 $ 7,272 AVERAGE SHARES OUTSTANDING: Weighted average Common Shares outstanding ........ 6,148,492 6,315,498 6,247,907 6,322,345 Net effect of the assumed exercise of stock options based on the treasury stock method ........... 194,539 178,306 167,535 202,440 - ------------------------------------------------------------------------------------------------------- Total ................................... 6,343,031 6,493,804 6,415,442 6,524,785 - ------------------------------------------------------------------------------------------------------- DILUTED EARNINGS PER SHARE ................. $ 0.43 $ 0.32 $ 1.24 $ 1.11 - ------------------------------------------------------------------------------------------------------- * Adjusted for 10% stock dividend issued June 15, 1999, to shareholders of record as of May 28, 1999.